cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A238096 a(n) = Sum_{k=2..n} floor(n/k)*floor((tau(k)+1)/2), where tau = A000005.

Table of values

n a(n)
1 0
2 1
3 2
4 5
5 6
6 10
7 11
8 16
9 19
10 23
11 24
12 33
13 34
14 38
15 42
16 50
17 51
18 60
19 61
20 70
21 74
22 78
23 79
24 94
25 97
26 101
27 106
28 115
29 116
30 129
31 130
32 141
33 145
34 149
35 153
36 172
37 173
38 177
39 181
40 196
41 197
42 210
43 211
44 220
45 229
46 233
47 234
48 257
49 260
50 269
51 273
52 282
53 283
54 298
55 302
56 317
57 321
58 325
59 326
60 353
61 354
62 358
63 367
64 382
65 386
66 399
67 400
68 409
69 413
70 426

List of values

[0, 1, 2, 5, 6, 10, 11, 16, 19, 23, 24, 33, 34, 38, 42, 50, 51, 60, 61, 70, 74, 78, 79, 94, 97, 101, 106, 115, 116, 129, 130, 141, 145, 149, 153, 172, 173, 177, 181, 196, 197, 210, 211, 220, 229, 233, 234, 257, 260, 269, 273, 282, 283, 298, 302, 317, 321, 325, 326, 353, 354, 358, 367, 382, 386, 399, 400, 409, 413, 426]